Type wheel for telegraph apparatus



setfz; 1942.

M. DRESSLER TYPE WHEEL FOR TELEGRAPH APPARATUS Filed Sept. 12, 1940 Patented Sept. 29, 1942 TYEE WHEEL FOR TELEGRAPH APPARATUS Max Dressler, Berlin-Haselhorst, Germany; vested in the Alien Property Custodian Application September 12, 1940, Serial No. 356,455 In Germany July 15, 1939 3 Claims.

This invention relates to a type wheel for telegraph apparatus.

Telegraph apparatus employing a type wheel presents the drawback that the last character of a communication printed by the type wheel is often not visible to the operator. To render the last character visible various ways have already been proposed which, however, entail a more or less complicated construction of the apparatus.

In telegraph apparatus in which the type wheel returns to the position of rest after each character has been printed the above-mentioned drawback may be avoided in a very simple manner. This may be accomplished according to the invention by cutting out from the type wheel at least that portion of the rim which in its position of rest is opposite to the paper tape in such a manner that the last character of a communication printed by the type wheel is visible.

In apparatus in which the type wheel is inked by an ink roller the type wheel is machined to such an extent as to leave on the side of the type wheel away from the operator sufiicient stock to maintain on this side the circular form of the type wheel. In this manner the ink roller is prevented from engaging the recess.

The invention is illustrated in the accompanying drawing, wherein Fig. 1 shows an embodiment of the invention in diagrammatic form, including a type wheel recessed for the purpose stated above, and Fig. 2 shows a cross-section through the type wheel taken on a diameter which intersects the recess.

In Fig. 1 is shown a type wheel I for an apparatus whose individual characters are formed of character elements corresponding to portions of letters, as illustrated and described, for instance, in the U. S. Patent No. 2,139,452. The type wheel of such an apparatus operating on the start-stop principle is, for instance, driven by the shaft 2 and inked by the ink-roller 4 mounted on the shaft 3.

The printing is brought about by pressing the paper tape 5 against the type wheel with the aid of a printing hammer (not shown). If it is assumed that the transmitted communication ends with the word Berlin as shown on the paper tape, and if an ordinary type wheel is employed, the operator cannot read the last letter on the tape inserted in the apparatus.

The type Wheel of the above-mentioned apparatus stops, however, according to the startstop principle always in a given angular position after each letter has been printed. This fact is taken advantage of according to the invention to provide a recess H1 in the type wheel. As shown, the type wheel is in the position of rest in which the recess I0 is opposite to the paper tape. As will be seen from the drawing, the last letter n of the word Berlin is visible on the paper tape H. To prevent the ink roller 4 from engaging the recess ID, the latter is so cut as to leave as indicated at I2, Fig. 2, on the side away from the operator, an amount of stock of the type wheel rim sufiicient to maintain the circular form thereof.

The invention may as in the embodiment shown be applied to an apparatus operating with characters formed of character elements. It may, however, also be employed in known apparatus employing the fiveor six-unit code and operating on the start-stop principle. In order that the invention may be carried into practice the type wheel must return after each letter has been printed to the initial position. However, this is the case with a great number of type wheel receivers employing the five-unit code and operating on the start-stop principle.

What is claimed is:

1. In a printing telegraph receiver in which the type wheel returns to a. predetermined normal position after each character has been printed, a type wheel having a recess in that portion of its periphery which is adjacent the tape in the normal position of the type wheel, whereby the last character of the printed communication is rendered visible.

2. A type wheel as claimed in claim 1, wherein the recess is limited in depth axially of the type wheel so as to leave a part of the rim of the wheel intact for engagement with an inking roller.

3. For use in a start-stop printing telegraph receiver, a type wheel which is cut away on the side toward the operator to form. a recess intersecting the periphery of the wheel, said recess being located in that part of the periphery of the wheel which is adjacent the tape when the wheel is at rest, whereby the recess is effective to expose the tape beneath the wheel and render the last printed character visible to the operator.

MAX DRESSLER, 

